Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ec9c03360fd3d8…

MALICIOUS

PDF

38.5 KB Created: 2020-08-19 06:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17be5febceb93649529666e545d50b66 SHA-1: f67634f09fc6350a733b5457b634e89bad50dfe4 SHA-256: 71ec9c03360fd3d8536aae6ac6fdc8b3fc02b69f54e06fa154ce4e5d502939bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. This suggests the document is part of a link farm designed to obscure malicious destinations and potentially distribute malware or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=boogie+woogie+english+song
    • http://lawubep.developinganaesthesia.org/uploads/1/3/2/6/132681513/vewop.pdf
    • http://files.kamagraoz.com/uploads/1/3/1/6/131637658/7524531.pdf
    • http://darija.playbyplaytheatre.org/uploads/1/3/1/4/131407278/1f7d5905.pdf
    • http://files.livinmybliss.com/uploads/1/3/2/6/132683135/b7b3e3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/calculus_analytic_geometry_larson.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/86622454870.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/dusekuvofesib.pdf
    • https://cdn.shopify.com/s/files/1/0428/7224/2342/files/3051274243.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/quadratic_equation_form_3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4528/9127/files/xakulatakuxefevofalegi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/arabic_words_into_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/33384748341.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/concave_and_convex_functions.pdf
    • https://cdn.shopify.com/s/files/1/0428/4071/9516/files/81754961990.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004db8.bin
e576578b3348812e1bdb86cf7adba6cc816c56772a3d2d11aadfa670ebafd6d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB8 4780 bytes
font_01_sfnt_off00005e15.bin
26636ab7f32519b1996ecf1d4ed6d7afe6db1516169fd849700a1730918be928
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 14576 bytes